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cross wires
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Example Sentences
Its defects are that it has no real focus where cross-wires can be placed, and that the field of view is very small.
From Project Gutenberg
Place the eye-piece with cross wires in the telescope, with the cross in the shape of an X.
From Project Gutenberg
And the forward sight will be a ring with cross wires in it.
From Project Gutenberg
The cross-wires, which should be of a stronger gauge, are then put in.
From Project Gutenberg
The angles of the triangles were measured with a quadrant furnished with a telescope having cross-wires.
From Project Gutenberg
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